contour_epicycle_chain — SHAPE2D `descriptor` op

• Data kinds: matrix → pairs

• Call: import fullseye as fs; fs.ledger.contour_epicycle_chain(spectrum, phase, order='frequency') (to call the implementation directly, import fourierdesc; fourierdesc.contour_epicycle_chain(spectrum, phase, order='frequency'); from the registry, opsshape2d.get("contour_epicycle_chain"))

Usage

> This operator's description has not been translated yet. The original text follows as it is.

位相 `t における**回る振り子の連鎖**を返す(pairs`)。

引数:

spectrum: :func:contour_fourier_complex の `(2K+1, 3)`。

phase: `t`(1 周 = 1.0)。

order: `"frequency"` = 低い周波数から積む(教科書の絵)/

`"amplitude"` = 振幅の大きい順(少ない項で似せる)。

返り値: `(M+1, 2) の pairs`((row, col) 順)。行 0 が最初の腕の中心、

行 `m が m` 番目の腕の先(= 次の腕の中心)、最後の行が筆先で、

これが再構成された輪郭の点そのものになる。腕 `m` の長さは

`|c_k|、角度は 2π k t + arg c_k`。

Detailed usage guide

• shape_description_2d family guide

References (sample data, literature)

• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).

• Operator provenance and references — the sources of the research/methods this op family came from.

• The canonical algorithm (author, year) and its uses are named in the family usage guide above.

Runnable examples (verified samples that actually call this op)

• poc_one_stroke_epicycles — py -3.11 examples/poc_one_stroke_epicycles.py

Ops the type connects to (they accept `pairs` as input)

elliptic_fourier · fourier_smooth · contour_fourier_complex · add_frame_corners · warp_tps_image · warp_piecewise_affine · morph · morph_sequence

Same category (`descriptor`)

elliptic_fourier · reconstruct · invariants · normalize · descriptor_distance · fourier_smooth · from_xld · contour_fourier_complex

*Provenance: fourierdesc.py — SHAPE2D operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

contour_epicycle_chain — SHAPE2D descriptor op